JP2007139780A - 自由空間共振器を備える光ジャイロおよび慣性回転速度を感知する方法 - Google Patents
自由空間共振器を備える光ジャイロおよび慣性回転速度を感知する方法 Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/58—Turn-sensitive devices without moving masses
- G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
- G01C19/72—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers
- G01C19/726—Phase nulling gyrometers, i.e. compensating the Sagnac phase shift in a closed loop system
Abstract
【解決手段】空気または真空の自由空間光経路を有する共振器を使用して、軸の周りのリング共振器の回転速度を感知する。リング共振器は、基板30と、基板上に形成または配置された反射器20、22、24、26とを備える。反射器は閉光路39を有し、第1および第2の光ビームのそれぞれを閉光路の相異なる逆伝播方向に向けるように構成される。第1および第2の光ビーム周波数のそれぞれが、光ビームが閉光路内を循環している伝播方向の共振器の共振周波数に同調される。
【選択図】図1
Description
11 光源
12 ビームジェネレータ
13 ビームスプリッタ
14 共振器
15 第1の波形変調器
16 光センサ
17 周波数シフタ
18 プロセッサ
19 第2の波形変調器
20、22、24、26 反射器
29 第1の光ベンチ
30 第1の基板
31 第2の光ベンチ
32 第2の基板
34 信号処理電子回路
35 光センサ
36、37 ミニチュア光学素子
38 レーザ
39 閉光路
40 共振器
42、44、46、48、50、52、54、56 反射要素
Claims (10)
- 基板(30)と、
前記基板上の、閉光路(39)を有し、第1および第2の光ビームのそれぞれを前記閉光路の異なる逆伝播方向に向けるように構成され、前記第1および第2の光ビームのそれぞれが、前記閉光路で循環したときに共振周波数を有する1組の反射面(20、22、24、26)と、
を備える第1および第2の光ビームを循環させるリング共振器。 - 前記1組の反射面は、前記基板上の複数のミラー反射器を備え、前記複数のミラー反射器のそれぞれは、自由空間を通じて前記閉光路に沿うように第1および第2の光ビームを向けるように構成される、請求項1に記載のリング共振器。
- 前記閉光路は表面エリアを取り囲み、少なくとも2つのループを有し、前記1組の反射面は、
前記第1の光ビームを前記閉光路に沿って第1の逆伝播方向に向け、
前記第2の光ビームを前記閉光路に沿って第2の逆伝播方向に向けるように構成される、請求項1に記載のリング共振器。 - 前記1組の反射面は前記基板上の複数のミラー反射器を有し、前記複数のミラー反射器の第1のサブセットは、前記第1および第2の光ビームのそれぞれを前記閉光路に沿って第1のループに向けるように構成され、前記複数のミラー反射器の第2のサブセットは、前記第1および第2の光ビームのそれぞれを前記閉光路に沿って第2のループに向けるように構成される、請求項3に記載のリング共振器。
- 前記第1の光ビームの前記共振周波数は第1の逆伝播方向の共振周波数を示し、前記第2の光ビームの前記共振周波数は第2の逆伝播方向の共振周波数を示し、前記第1の逆伝播方向の前記共振周波数と前記第2の逆伝播方向の前記共振周波数の差は、リング共振器の回転速度に比例する、請求項1に記載のリング共振器。
- 前記基板は、シリコン基板とシリコンオンインシュレータ基板の少なくとも一方から選択される、請求項1に記載のリング共振器。
- 前記反射器の組は、前記基板に対するエッチングプロセスで形成され、前記反射器の組が高反射率被覆を有する、請求項1に記載のリング共振器。
- 少なくとも1つの基板(30、32)と、
第1および第2の光ビームを生成するように構成された、前記少なくとも1つの基板上のビームジェネレータ(12)と、
前記少なくとも1つの基板上の閉光路(39)を有し、前記第1および第2の光ビームのそれぞれの一部を前記閉光路の異なる逆伝播方向に循環するように構成され、前記第1および第2の光ビームの前記一部のそれぞれが、前記閉光路で循環したときに共振周波数を有する、1組の反射面と、
前記第1の逆伝播方向の第1の共振周波数および前記第2の逆伝播方向の第2の共振周波数を検出するように構成された、前記少なくとも1つの基板上のセンサ(16)と、
前記センサに結合され、前記第1の共振周波数と前記第2の共振周波数との間の差に基づいて光ジャイロの回転速度を求めるように構成された、プロセッサ(18)と、
を備える光ジャイロ。 - 前記基板上の1組の反射面により、自由空間を通じて閉光路に沿って第1および第2の逆伝播光ビームを循環させるステップ(105)と、
前記リング共振器の光伝播の第1の逆伝播方向の第1の共振周波数を生成するステップ(110)と、
前記リング共振器の光伝播の第2の逆伝播方向の第2の共振周波数を生成するステップ(115)と、
前記第1の共振周波数と前記第2の共振周波数との間の回転速度を示す周波数偏移を測定するステップ(120)と、
を含む基板上に形成されたリング共振器の回転速度を感知する方法。 - 前記循環させるステップは、
前記第1および第2の逆伝播光ビームのそれぞれを、第1の組のミラー反射器により前記閉光路に沿って第1のループに向けるステップと、
前記第1および第2の逆伝播光ビームのそれぞれを、第2の組のミラー反射器により前記閉光路に沿って第2のループに向けるステップと
を含む、請求項9に記載の方法。
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US11/282,229 US7362443B2 (en) | 2005-11-17 | 2005-11-17 | Optical gyro with free space resonator and method for sensing inertial rotation rate |
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US20070109549A1 (en) | 2007-05-17 |
US7362443B2 (en) | 2008-04-22 |
EP1788352A3 (en) | 2009-01-21 |
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